ipn/store: make StateStore.All optional (#16409)

This method is only needed to migrate between store.FileStore and
tpm.tpmStore. We can make a runtime type assertion instead of
implementing an unused method for every platform.

Updates #15830

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>

cmd/tsconnect/src/lib/js-state-store.ts

@@ -10,7 +10,4 @@ export const sessionStateStorage: IPNStateStorage = {
   getState(id) {
     return window.sessionStorage[`ipn-state-${id}`] || ""
   },
-  all() {
-    return JSON.stringify(window.sessionStorage)
-  },
 }

cmd/tsconnect/src/types/wasm_js.d.ts

@@ -44,7 +44,6 @@ declare global {
   interface IPNStateStorage {
     setState(id: string, value: string): void
     getState(id: string): string
-    all(): string
   }
 
   type IPNConfig = {

cmd/tsconnect/wasm/wasm_js.go

@@ -15,7 +15,6 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
-	"iter"
 	"log"
 	"math/rand/v2"
 	"net"
@@ -580,29 +579,6 @@ func (s *jsStateStore) WriteState(id ipn.StateKey, bs []byte) error {
 	return nil
 }
 
-func (s *jsStateStore) All() iter.Seq2[ipn.StateKey, []byte] {
-	return func(yield func(ipn.StateKey, []byte) bool) {
-		jsValue := s.jsStateStorage.Call("all")
-		if jsValue.String() == "" {
-			return
-		}
-		buf, err := hex.DecodeString(jsValue.String())
-		if err != nil {
-			return
-		}
-		var state map[string][]byte
-		if err := json.Unmarshal(buf, &state); err != nil {
-			return
-		}
-
-		for k, v := range state {
-			if !yield(ipn.StateKey(k), v) {
-				break
-			}
-		}
-	}
-}
-
 func mapSlice[T any, M any](a []T, f func(T) M) []M {
 	n := make([]M, len(a))
 	for i, e := range a {